I couldn't find a website definition but I quickly read over the basis for his approach, and fidel may be an acronym which stands for the following:

FunctionIntonationDifferentiateEnunciateLandmark

While reading through his theoretical writings I discovered that these are the major things he pointed to in terms of his silent way methodology...Hope this lends a little light, but if I am off base, it still works for describing the approach...

wow..thank you very much..it will definately help..i dont need to write about it in the thesis..but I will definately be asked about it during the defense..and this is a very creative answer even if it might be wrong